초록 ▼

In a burst mode communication system bursts arrive at a receiver which must correctly acquire and track carrier and clock phases in order to recover the transmitted symbols. A burst mode receiver is used to recover the clock and carrier phase. The detection of an initiator pulse indicates the presen

In a burst mode communication system bursts arrive at a receiver which must correctly acquire and track carrier and clock phases in order to recover the transmitted symbols. A burst mode receiver is used to recover the clock and carrier phase. The detection of an initiator pulse indicates the presence of a burst signal, and a cross-coupled fractionally spaced digital filter structure is used with a known preamble to perform symbol sampling phase recovery and carrier phase acquisition, and during the normal mode of operation results in a tracking of the symbol and carrier phases.

대표청구항 ▼

[ What is claimed is:] [1.] A method for generating recovered symbols from a received signal at a receive end of a burst mode communications system, said burst mode communications system having bursts containing a predetermined preamble and data which are coded into symbols, modulated onto a carrier

[ What is claimed is:] [1.] A method for generating recovered symbols from a received signal at a receive end of a burst mode communications system, said burst mode communications system having bursts containing a predetermined preamble and data which are coded into symbols, modulated onto a carrier and transmitted from a transmit end, said method comprising:(a) converting a received signal from a continuous time signal to a discrete time signal;(b) downconverting said discrete time signal to produce a first complex baseband signal having at least two signal samples per symbol;(c) detecting the presence of a burst in said first complex baseband signal;(d) filtering said first complex baseband signal using at least one digital filter means having adjustable tap coefficients;(e) decimating said first complex baseband signal to produce a second complex baseband signal having one signal sample per symbol;(f) thresholding said second complex baseband signal to produce a third complex baseband signal containing recovered symbols;(g) generating an error signal based upon a comparison of said recovered symbols to a set of symbols stored at said receiver end; and(h) adjusting said tap coefficients to minimize said error signal.